上云——docker基础篇：挂载、制作dockerfile
文章目录
- 1 容器数据卷
-
- 使用数据卷
- 具名和匿名挂载
- 预了解docker file
- 数据卷容器
- 2 Docker file
-
- 构建过程
- dockerfile指令介绍
- dockerfile举例
- CMD和ENTRYPOINT区别
- tomcat镜像制作
- 发布镜像到dockerhub
1 容器数据卷
# 将容器内的数据同步到本地，目录挂载在本地（持久化）
使用数据卷
方式一
# 方式一：直接使用命令来挂载
docker run -it -v 主机目录,容器内目录
# 案例 /usr/local/docker_data/test是主机目录,/home是容器目录
[root@lv94 docker_data]# docker run -it -v /usr/local/docker_data/test:/home centos /bin/bash
# 查看容器的相关信息
docker inspect 容器id
# Mounts就是挂载的相关信息
不管是在主机还是在容器内对该路径下文件操作，都会同步改变，即使容器exit后修改目录下文件后重新attach容器发现是同步修改过的
docker安装mysql利用挂载目录
# 下载docker镜像
docker pull mysql:5.7
# 主机挂载mysql conf文件、数据目录、用户名密码
# 官方案例：docker run --name some-mysql -e MYSQL_ROOT_PASSWORD=my-secret-pw -d mysql:tag
-d 后台运行
-p 端口映射
-v 数据卷挂载
-e 环境参数配置
--name 容器名称
[root@lv94 docker]# docker run -d -p 3344:3306 -v /usr/local/soft/docker/mysql/conf:/etc/mysql/conf.d -v /usr/local/soft/docker/mysql/data:/var/lib/mysql -e MYSQL_ROOT_PASSWORD=123456 --name mysql01 mysql:5.7
# 启动后，用数据库管理和设计工具(比如DBeaver、Navicat)进行连接，可以连接成功
# 新建一个数据后，发现挂载的目录下也会同样出现该数据
具名和匿名挂载
# 匿名挂载
-v 容器内路径
`下面的情况就是匿名挂载，因为没有指定挂载所在主机路径,只是指定了容器的目录`
[root@lv94 docker]# docker run -d -P --name nginx03 -v /etc/nginx nginx
205ac0f317013b86114a14736f5f7a721a5295264bfa88b64d082dc09eb7f1c3
# 查看所有volume的情况
[root@lv94 docker]# docker volume ls
DRIVER VOLUME NAME
local 4bcc8cf2fc420c1e0f909ebb3085e7d77b66c851752592527e5d492932616ca7
local 56e19184c820b393305a44b93e8aa5869bfce2606d4bc26c2514d014ab1a4f3b
local 223a3e41073f3ac968a86625aec7c6957052e3cce6982f571a10751c5502631a
[root@lv94 docker]#
[root@lv94 docker]# docker run -d -P --name nginx04 -v specificname_nginx:/etc/nginx nginx
28626c8b0afbe19539e58650b5d80159b9e151650f1185cc5e628ff32b480743
[root@lv94 docker]# docker volume ls
DRIVER VOLUME NAME
local 4bcc8cf2fc420c1e0f909ebb3085e7d77b66c851752592527e5d492932616ca7
local 56e19184c820b393305a44b93e8aa5869bfce2606d4bc26c2514d014ab1a4f3b
local 223a3e41073f3ac968a86625aec7c6957052e3cce6982f571a10751c5502631a
local specificname_nginx
[root@lv94 docker]#
# 如何用volume name找到主机挂载的目录
docker volume inspect [VOLUME NAME]
[root@lv94 docker]# docker volume inspect specificname_nginx
[
{
"CreatedAt": "2021-11-12T19:48:33+08:00",
"Driver": "local",
"Labels": null,
"Mountpoint": "/var/lib/docker/volumes/specificname_nginx/_data",
"Name": "specificname_nginx",
"Options": null,
"Scope": "local"
}
]
# 没有指定的挂载目录其实都在/var/lib/docker/volumes/xxx 下
区别具名挂载、匿名挂载、指定路径挂载？
-v + xxx 挂载类型 容器内路径 匿名挂载 卷名:容器内路径 具名挂载 /主机路径:容器内路径 指定路径挂载 部分还有加上权限的功能,ro:只读、rw:可读可写，ro只能通过主机操作，容器内部无权限，默认是rw
比如:docker run -d -P --name nginx04 -v specificname_nginx:/etc/nginx:ro nginx
docker run -d -P --name nginx04 -v specificname_nginx:/etc/nginx:rw nginx
预了解docker file
方式二docker file是用来构建docker镜像的构建文件命令脚本
通过脚本可以生成镜像，镜像是分层结构的，脚本自然是一个个的，对应每一层
举例：创建一个文件，比如dockerfile1，输入以下代码保存
FROM centos VOLUME ["volume01","volume02"] CMD echo "---success---" CMD /bin/bash命令行输入docker bulid
[root@lv94 docker-test-volume]# docker build -f dockerfile1 -t xiaoyoupei/centos . Sending build context to Docker daemon 2.048kB Step 1/4 : FROM centos ---> 5d0da3dc9764 Step 2/4 : VOLUME ["volume01","volume02"] ---> Running in b479f0273842 Removing intermediate container b479f0273842 ---> 52090f97f6f6 Step 3/4 : CMD echo "---success---" ---> Running in 9c3ea2e0f86a Removing intermediate container 9c3ea2e0f86a ---> 903915689e09 Step 4/4 : CMD /bin/bash ---> Running in 0a71b49dd88d Removing intermediate container 0a71b49dd88d ---> c898e5abd096 Successfully built c898e5abd096 Successfully tagged xiaoyoupei/centos:latest查看镜像docker images
[root@lv94 docker-test-volume]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE xiaoyoupei/centos latest c898e5abd096 53 seconds ago 231MB可以看到我们是带了挂载的直接docker ps，查看容器id再查看详细信息docker inspect 容器id，就可以找到Mounts下的文件挂载主机的路径，这是匿名的
数据卷容器
多个容器如何同步数据？采用数据卷容器
# 启动第一个
[root@lv94 ~]# docker run -it --name docker01 xiaoyoupei/centos
[root@0f1d9d632b4e /]# ls
bin etc lib lost+found mnt proc run srv tmp var volume02
dev home lib64 media opt root sbin sys usr volume01
# 还记得怎么退出？ctrl+p+q
# 启动第二个
[root@lv94 ~]# docker run -it --name docker02 --volumes-from docker01 xiaoyoupei/centos
[root@cf4f92daf880 /]# ls
bin etc lib lost+found mnt proc run srv tmp var volume02
dev home lib64 media opt root sbin sys usr volume01
# 在被挂载的docker01目录中创建目录看docker02是否存在
[root@lv94 ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
cf4f92daf880 xiaoyoupei/centos "/bin/sh -c /bin/bash" 54 seconds ago Up 53 seconds docker02
0f1d9d632b4e xiaoyoupei/centos "/bin/sh -c /bin/bash" 4 minutes ago Up 4 minutes docker01
1bc0aebaf557 mysql:5.7 "docker-entrypoint.s…" 29 hours ago Up 29 hours 33060/tcp, 0.0.0.0:3344->3306/tcp mysql03
cd225e4de078 portainer/portainer "/portainer" 6 days ago Up 6 days 0.0.0.0:8089->9000/tcp sleepy_liskov
[root@lv94 ~]# docker attach 0f1d9d632b4e
[root@0f1d9d632b4e /]# ls
bin etc lib lost+found mnt proc run srv tmp var volume02
dev home lib64 media opt root sbin sys usr volume01
[root@0f1d9d632b4e /]# cd volume01/
[root@0f1d9d632b4e volume01]# ls
[root@0f1d9d632b4e volume01]# touch docker01
[root@0f1d9d632b4e volume01]# read escape sequence
[root@lv94 ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
cf4f92daf880 xiaoyoupei/centos "/bin/sh -c /bin/bash" 2 minutes ago Up 2 minutes docker02
0f1d9d632b4e xiaoyoupei/centos "/bin/sh -c /bin/bash" 5 minutes ago Up 5 minutes docker01
1bc0aebaf557 mysql:5.7 "docker-entrypoint.s…" 29 hours ago Up 29 hours 33060/tcp, 0.0.0.0:3344->3306/tcp mysql03
cd225e4de078 portainer/portainer "/portainer" 6 days ago Up 6 days 0.0.0.0:8089->9000/tcp sleepy_liskov
[root@lv94 ~]# docker attach cf4f92daf880
[root@cf4f92daf880 /]# cd volume01/
[root@cf4f92daf880 volume01]# ls
docker01
得出结论，docker01创建的内容同步到了docker02上面，可以类比java中子类继承父类的；这个docker01就是数据卷容器
# 同理，再创建docker03也会共享
[root@lv94 ~]# docker run -it --name docker03 --volumes-from docker01 xiaoyoupei/centos
[root@be64d3656dfb /]# cd volume0
bash: cd: volume0: No such file or directory
[root@be64d3656dfb /]# cd volume01/
[root@be64d3656dfb volume01]# ls
docker01
[root@be64d3656dfb volume01]# touch docker03
[root@be64d3656dfb volume01]#
[root@lv94 ~]# docker attach docker01
[root@0f1d9d632b4e volume01]# ls
docker01 docker03
那问题来了？如何删除docker01，会出现什么影响？数据还在嘛？
[root@lv94 ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
be64d3656dfb xiaoyoupei/centos "/bin/sh -c /bin/bash" 2 minutes ago Up 2 minutes docker03
cf4f92daf880 xiaoyoupei/centos "/bin/sh -c /bin/bash" 9 minutes ago Up 9 minutes docker02
0f1d9d632b4e xiaoyoupei/centos "/bin/sh -c /bin/bash" 12 minutes ago Up 12 minutes docker01
1bc0aebaf557 mysql:5.7 "docker-entrypoint.s…" 29 hours ago Up 29 hours 33060/tcp, 0.0.0.0:3344->3306/tcp mysql03
cd225e4de078 portainer/portainer "/portainer" 6 days ago Up 6 days 0.0.0.0:8089->9000/tcp sleepy_liskov
[root@lv94 ~]# docker rm -f 0f1d9d632b4e
0f1d9d632b4e
[root@lv94 ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
be64d3656dfb xiaoyoupei/centos "/bin/sh -c /bin/bash" 2 minutes ago Up 2 minutes docker03
cf4f92daf880 xiaoyoupei/centos "/bin/sh -c /bin/bash" 9 minutes ago Up 9 minutes docker02
1bc0aebaf557 mysql:5.7 "docker-entrypoint.s…" 29 hours ago Up 29 hours 33060/tcp, 0.0.0.0:3344->3306/tcp mysql03
cd225e4de078 portainer/portainer "/portainer" 6 days ago Up 6 days 0.0.0.0:8089->9000/tcp sleepy_liskov
[root@lv94 ~]# docker attach docker02
[root@cf4f92daf880 volume01]# ls
docker01 docker03
结论是即使被挂载的容器删除了，需挂载的容器数据还在
，为什么？因为这是备份的，所以容器虽然是隔离的，但是数据是可以共享的，应用场景比如mysql共享
# 还记得-v指的是什么？匿名挂载
[root@lv94 ~]# docker run -d -p 3344:3306 -v /etc/mysql/conf.d -v /var/lib/mysql -e MYSQL_ROOT_PASSWORD=123456 --name mysql01 mysql:5.7
[root@lv94 ~]# docker run -d -p 3344:3306 -e MYSQL_ROOT_PASSWORD=123456 --name mysql02 --volumes-form mysql01 mysql:5.7
我们可以设想一下这个应用场景，是不是想到了安装某些集群组件的时候，拷贝文件？如何消除
2 Docker file
`命令参数的脚本`
# 构建的步骤
1、编写docker file文件
2、docker bulid 构建镜像
3、docker run 运行镜像
4、docker push 发布镜像(DockerHub)
构建过程
# 前提知识
1、每个关键字(指令)都必须是大写字母
2、执行从上到下顺序执行
3、# 号符表示注释
4、每一个指令都会创建一个新的镜像层(分层结构)，并提交
在实际项目的时，发布项目需要做镜像，需要创作dockerfile文件，越来越成为项目交付的主流
名词关系
docker file：梳理流程、构建文件，相当于源代码
docker images：通过dockerfile构建生成的镜像，最终发布运行的产品，可以理解为jar——>dockerimages
docker container：将dockerimages运行提供服务
dockerfile指令介绍
| 关键字 | 解释 |
|---|---|
| FROM | 基础镜像 |
| MAINTAINER | 镜像是谁创作的 |
| RUN | 镜像运行的命令 |
| ADD | 镜像层级步骤 |
| WORKDIR | 镜像工作目录 |
| VOLUME | 镜像挂载的目录 |
| EXPOSE | 镜像暴露的端口 |
| CMD | 指定容器启动运行时命令，只有最后一个会生效，可被替代 |
| ENTRYPOINT | 指定容器启动运行时命令，可以追加命令 |
| ONBUILD | 构建一个被继承dockerfile后，会触发该命令 |
| COPY | 类似ADD，将文件拷贝到镜像中 |
| ENV | 构建时设置环境变量 |
dockerfile举例
dockerfile的FROM基本先写一个FROM scratch
# 构建属于你的centos
# 1、构建dockerfile文件
[root@lv94 dockerfile]# cat dockerfile_test_centos
FROM centos
MAINTAINER xiaoyoupei<[email protected]>
ENV MYPATH /usr/local
WORKDIR $MYPATH
RUN yum -y install vim
RUN yum -y install net-tools
EXPOSE 80
CMD echo $MYPATH
CMD echo "----successed----"
CMD /bin/bash
# 2、通过dockerfile构建镜像
[root@lv94 dockerfile]# docker build -f dockerfile_test_centos -t mycentos .
成功后会
Successfully built 65cbdddb7fb9
Successfully tagged mycentos:latest
# 3、运行该容器
[root@lv94 dockerfile]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
mycentos latest 65cbdddb7fb9 About a minute ago 342MB
xiaoyoupei/centos latest c898e5abd096 4 days ago 231MB
tomcat_test 1.0 89422e30211d 5 days ago 684MB
tomcat 9.0 43e421a14aec 3 weeks ago 680MB
tomcat latest b0e0b0a92cf9 3 weeks ago 680MB
mysql 5.7 938b57d64674 4 weeks ago 448MB
redis latest 7faaec683238 5 weeks ago 113MB
nginx latest 87a94228f133 5 weeks ago 133MB
centos latest 5d0da3dc9764 2 months ago 231MB
portainer/portainer latest 580c0e4e98b0 8 months ago 79.1MB
elasticsearch 7.6.2 f29a1ee41030 20 months ago 791MB
[root@lv94 dockerfile]# docker run -it mycentos
[root@e1b09e3d0467 local]# pwd
/usr/local
[root@e1b09e3d0467 local]# ls
bin etc games include lib lib64 libexec sbin share src
[root@e1b09e3d0467 local]# ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 172.17.0.3 netmask 255.255.0.0 broadcast 172.17.255.255
ether 02:42:ac:11:00:03 txqueuelen 0 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
loop txqueuelen 1000 (Local Loopback)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
[root@e1b09e3d0467 local]# ls
bin etc games include lib lib64 libexec sbin share src
[root@e1b09e3d0467 local]# vim test
[root@e1b09e3d0467 local]# vim test
[root@e1b09e3d0467 local]# ls
bin etc games include lib lib64 libexec sbin share src test
# 显示镜像构建的历史步骤
[root@lv94 dockerfile]# docker history 65cbdddb7fb9
IMAGE CREATED CREATED BY SIZE COMMENT
65cbdddb7fb9 5 minutes ago /bin/sh -c #(nop) CMD ["/bin/sh" "-c" "/bin… 0B
098b46b0dea9 5 minutes ago /bin/sh -c #(nop) CMD ["/bin/sh" "-c" "echo… 0B
e4375ef988bc 5 minutes ago /bin/sh -c #(nop) CMD ["/bin/sh" "-c" "echo… 0B
2f4f46c7b8e6 5 minutes ago /bin/sh -c #(nop) EXPOSE 80 0B
50d8e8fc024d 5 minutes ago /bin/sh -c yum -y install net-tools 35MB
98a19a4bd5dc 5 minutes ago /bin/sh -c yum -y install vim 76.2MB
d8849c91e2f3 6 minutes ago /bin/sh -c #(nop) WORKDIR /usr/local 0B
873203768a7b 6 minutes ago /bin/sh -c #(nop) ENV MYPATH=/usr/local 0B
a739de5e10c7 6 minutes ago /bin/sh -c #(nop) MAINTAINER xiaoyoupei
5d0da3dc9764 2 months ago /bin/sh -c #(nop) CMD ["/bin/bash"] 0B
<missing> 2 months ago /bin/sh -c #(nop) LABEL org.label-schema.sc… 0B
<missing> 2 months ago /bin/sh -c #(nop) ADD file:805cb5e15fb6e0bb0… 231MB
CMD和ENTRYPOINT区别
CMD 指定容器启动运行时命令，只有最后一个会生效，可被替代 ENTRYPOINT 指定容器启动运行时命令，可以追加命令
# 测试CMD
[root@lv94 dockerfile]# cat docker_test_cmd
FROM centos
CMD ["ls","-a"]
[root@lv94 dockerfile]# docker build -f docker_test_cmd -t cmdtest .
Sending build context to Docker daemon 3.072kB
Step 1/2 : FROM centos
---> 5d0da3dc9764
Step 2/2 : CMD ["ls","-a"]
---> Running in 6c3a23421744
Removing intermediate container 6c3a23421744
---> c37b2be7374b
Successfully built c37b2be7374b
Successfully tagged cmdtest:latest
[root@lv94 dockerfile]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
cmdtest latest c37b2be7374b 30 seconds ago 231MB
mycentos latest 65cbdddb7fb9 11 minutes ago 342MB
xiaoyoupei/centos latest c898e5abd096 4 days ago 231MB
tomcat_test 1.0 89422e30211d 5 days ago 684MB
tomcat 9.0 43e421a14aec 3 weeks ago 680MB
tomcat latest b0e0b0a92cf9 3 weeks ago 680MB
mysql 5.7 938b57d64674 4 weeks ago 448MB
redis latest 7faaec683238 5 weeks ago 113MB
nginx latest 87a94228f133 5 weeks ago 133MB
centos latest 5d0da3dc9764 2 months ago 231MB
portainer/portainer latest 580c0e4e98b0 8 months ago 79.1MB
elasticsearch 7.6.2 f29a1ee41030 20 months ago 791MB
[root@lv94 dockerfile]# docker run cmdtest
.
..
.dockerenv
bin
dev
etc
home
lib
lib64
lost+found
media
mnt
opt
proc
root
run
sbin
srv
sys
tmp
usr
var
# 可以追加命令嘛？试试看
[root@lv94 dockerfile]# docker run cmdtest -l
docker: Error response from daemon: OCI runtime create failed: container_linux.go:380: starting container process caused: exec: "-l": executable file not found in $PATH: unknown.
ERRO[0000] error waiting for container: context canceled
# 直接报错
# 写完全就可以
[root@lv94 dockerfile]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
cmdtest latest c37b2be7374b 5 minutes ago 231MB
[root@lv94 dockerfile]# docker run c37b2be7374b ls -al
total 0
drwxr-xr-x 1 root root 6 Nov 16 12:24 .
drwxr-xr-x 1 root root 6 Nov 16 12:24 ..
-rwxr-xr-x 1 root root 0 Nov 16 12:24 .dockerenv
lrwxrwxrwx 1 root root 7 Nov 3 2020 bin -> usr/bin
......
# 测试ENTRYPOINT
[root@lv94 dockerfile]# cat docker_test_entrypoint
FROM centos
ENTRYPOINT ["ls","-a"]
[root@lv94 dockerfile]# docker build -f docker_test_entrypoint -t entrypointtest .
Sending build context to Docker daemon 4.096kB
Step 1/2 : FROM centos
---> 5d0da3dc9764
Step 2/2 : ENTRYPOINT ["ls","-a"]
---> Running in 02731ff5e636
Removing intermediate container 02731ff5e636
---> 85392d34fde9
Successfully built 85392d34fde9
Successfully tagged entrypointtest:latest
[root@lv94 dockerfile]# docker run entrypointtest
.
..
.dockerenv
bin
dev
etc
home
lib
lib64
......
[root@lv94 dockerfile]# docker run entrypointtest -l
total 0
drwxr-xr-x 1 root root 6 Nov 16 12:27 .
drwxr-xr-x 1 root root 6 Nov 16 12:27 ..
-rwxr-xr-x 1 root root 0 Nov 16 12:27 .dockerenv
lrwxrwxrwx 1 root root 7 Nov 3 2020 bin -> usr/bin
drwxr-xr-x 5 root root 340 Nov 16 12:27 dev
drwxr-xr-x 1 root root 66 Nov 16 12:27 etc
drwxr-xr-x 2 root root 6 Nov 3 2020 home
lrwxrwxrwx 1 root root 7 Nov 3 2020 lib ->
......
对比发现，entrypoint是可以直接拼接命令然后执行的，而cmd必须要写原生的命令
tomcat镜像制作
1、需要准备镜像文件tomcat压缩包、jdk的压缩包
[root@lv94 docker_tomcat_images]# ll -al total 198636 drwxr-xr-x 2 root root 75 Nov 17 18:19 . drwxr-xr-x 7 root root 114 Nov 17 18:02 .. -rw-r--r-- 1 root root 11579748 Nov 17 18:19 apache-tomcat-9.0.55.tar.gz -rw-r--r-- 1 root root 191817140 Nov 17 18:05 jdk-8u201-linux-x64.tar.gz2、编写dockerfile，官方命名
Dockerfile，bulid会自动找到该文件，不需要-f指定[root@lv94 docker_tomcat_images]# cat Dockerfile FROM centos MAINTAINER xiaoyoupei<[email protected]> COPY readme.txt /usr/local/readme.txt ADD jdk-8u201-linux-x64.tar.gz /usr/local/ ADD apache-tomcat-9.0.55.tar.gz /usr/local/ RUN yum -y install vim ENV MYPATH /usr/local WORKDIR $MYPATH ENV JAVA_HOME /usr/local/jdk1.8.0_201 ENV CLASS_HOME $JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar ENV CATALINA_HOME /usr/local/apache-tomcat-9.0.55 ENV CATALINA_BASH /usr/local/apache-tomcat-9.0.55 ENV PATH $PATH:$JAVA_HOME/bin:$CATAINA_HOME/lib:$CATALINA_HOME/bin EXPOSE 8080 CMD /usr/local/apache-tomcat-9.0.55/bin/startup.sh && tail -F /usr/local/apache-tomcat-9.0.55/bin/logs/catalina.out3、构建镜像
docker build -t mytomcat .4、启动镜像
[root@lv94 docker_tomcat_images]# docker run -d -p 7777:8080 --name mytomcat -v /usr/local/soft/docker/docker_tomcat_images/test:/usr/local/apache-tomcat-9.0.55/webapps/test -v /usr/local/soft/docker/docker_tomcat_images/logs:/usr/local/apache-tomcat-9.0.55/logs mytomcat5、访问测试
6、发布项目（在本地发布）
在test目录下新建WEB-INF目录，再在WEB-INF下新建web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5"> </web-app>在test目录下新建index.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>youpei test</title> </head> <body> Hello World!<br/> <% System.out.println("test test test"); %> </body> </html>7、访问主机7777端口的test页面（localhost:7777/test），发现成功
发布镜像到dockerhub
地址：hub.docker.com
# 登陆hub.docker.home
[root@lv94 docker_tomcat_images]# docker login
Login with your Docker ID to push and pull images from Docker Hub. If you don't have a Docker ID, head over to https://hub.docker.com to create one.
Username: xiaoyoupei
Password:
WARNING! Your password will be stored unencrypted in /root/.docker/config.json.
Configure a credential helper to remove this warning. See
https://docs.docker.com/engine/reference/commandline/login/#credentials-store
Login Succeeded
# 直接push会被拒绝，没有所属(例如：/xiaoyoupei/mytomcat)
[root@lv94 docker_tomcat_images]# docker push mytomcat:latest
The push refers to repository [docker.io/library/mytomcat]
0f413793c84a: Preparing
8bed38372bc5: Preparing
c59641a64679: Preparing
295cda1076a7: Preparing
74ddd0ec08fa: Preparing
denied: requested access to the resource is denied
# 出现这样的问题怎么解决？
[root@lv94 docker_tomcat_images]# docker push xiaoyoupei/mytomcat:latest
The push refers to repository [docker.io/xiaoyoupei/mytomcat]
An image does not exist locally with the tag: xiaoyoupei/mytomcat
# 加一个分支就行
[root@lv94 docker_tomcat_images]# docker tag 16d505da0355 xiaoyoupei/tomcat:1.0
[root@lv94 docker_tomcat_images]# docker push xiaoyoupei/tomcat:1.0
save、load
